Solar cell



FIG. 1 is a top perspective view of a solar cell, according to our new design embodiment of the design;

FIG. 2 is a top view thereof;

FIG. 3 is a bottom view thereof;

FIG. 4 is a right side elevation view thereof;

FIG. 5 is a left side elevation view thereof;

FIG. 6 is a back elevation view thereof; and,

FIG. 7 is a front elevation view thereof.

The broken lines shown are included for the purpose of illustrating a portion of the solar cell that form no part of the claimed design. 

CLAIM The ornamental design for a solar cell, as shown and described. 